Britain’s national debt could rise dramatically to nearly three times the size of the economy by 2075 if no corrective measures are taken, according to a report from the Office for Budget Responsibility (OBR). The UK’s independent fiscal watchdog highlighted that demographic shifts and economic factors will increasingly strain public finances, potentially pushing government debt onto an unsustainable trajectory.

Under the OBR’s baseline scenario, government borrowing is projected to increase steadily, driving debt from around 95% of gross domestic product (GDP) in 2030-2031 to approximately 300% of GDP by 2075-2076. The report emphasized that these projections should not be taken as forecasts but rather as illustrations of the long-term challenges facing the government. It noted that such explosive growth in debt is unlikely to occur unchecked, as future administrations are expected to implement policies aimed at stabilizing the fiscal path.

The OBR identified several key drivers behind the projected rise in debt, including the cost of the pension triple lock—a policy that guarantees annual increases in state pensions. The triple lock is anticipated to add significantly to public spending, with annual costs rising to about £15.5 billion by 2029-2030, nearly triple the originally estimated £5.2 billion. In addition to pensions, increased expenditure on defence and investments related to meeting net-zero carbon emissions targets are expected to contribute to rising fiscal pressures.

Responding to the report, Conservative Shadow Chancellor Sir Mel Stride called for decisive government action, emphasizing the need for tough decisions to secure funding for commitments like the pension triple lock. “Britain needs a government prepared to take tough decisions before it’s too late. That is how we will continue to meet commitments like providing security for our pensioners through the triple lock,” Stride said.

The Treasury defended the government’s fiscal strategy, noting that its deficit reduction plans have been endorsed by both the International Monetary Fund and the OBR. It stated that borrowing is forecast to decline each year during the current parliamentary term, which would place the UK’s debt trajectory below the G7 average.

The OBR’s findings underscore the long-term fiscal challenges facing the UK, driven by demographic changes, social commitments, and environmental goals. While the projections indicate a potentially unsustainable debt path, they also serve as a warning that proactive fiscal management will be needed to ensure economic stability in the decades ahead.